Hi Andy,
> J-S, did you get to do any timing with my proposed use of doubles in the
> intersection code?
I did some tests last night. Full results below. The "executive summary"
is this:
For 2,244,800 samples (individual ray tests),
Floats: 113.121566 seconds (original)
Doubles: 113.954178 seconds (your patch)
Difference: ~0.730655 %
Floats: 19844.138 samples / second
Doubles: 19699.146 samples / second
So with doubles, it is less than one percent slower, which I don't think
is significant over that many samples... I did not have the time to do
multiple tests though (because that 0.7% might even be due to some other
activity on my machine) but I think we can safely say it's not a
significant difference. You can quote me on that :-)
BTW, for reference, using the kdtree took 13.366302 seconds to do the
same thing :-) See below.
Hope this helps,
J-S
Detailed results:
===================================================================
LineSegmentIntersector, float (original)
===================================================================
- Parsing command-line arguments.
Using 5 bands (25 coefficients) and 400 samples per vertex.
Deleting previously calculated data files to recalculate them.
- Loading model file data/PRT_test_scene_9b.ive.
- Optimizing model data/PRT_test_scene_9b.ive.
- Loading/Computing SH coefficients for lighting
[L] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/lighting_25_400.prt:
Not found. Computing. 0.534819 seconds. (747.917 samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Wall2_geode_0_25_400_DS.prt:
Not found. Computing. (1017 vertices) 15.1999 seconds. (26763.4
samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Wall1_geode_0_25_400_DS.prt:
Not found. Computing. (930 vertices) 13.9724 seconds. (26624
samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Floor_geode_0_25_400_DS.prt:
Not found. Computing. (1596 vertices) 21.7206 seconds. (29391.5
samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Sphere_geode_0_25_400_DS.prt:
Not found. Computing. (1040 vertices) 40.901 seconds. (10170.9
samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Cube_geode_0_25_400_DS.prt:
Not found. Computing. (1029 vertices) 21.3278 seconds. (19298.8
samples/sec)
Total time for loading transfer functions: 113.121566 seconds.
Total loading/computing time: 113.657229 seconds.
Precalculation done, exiting.
===================================================================
LineSegmentIntersector, double (Andy Skinner's modification)
===================================================================
- Parsing command-line arguments.
Using 5 bands (25 coefficients) and 400 samples per vertex.
Deleting previously calculated data files to recalculate them.
- Loading model file data/PRT_test_scene_9b.ive.
- Optimizing model data/PRT_test_scene_9b.ive.
- Loading/Computing SH coefficients for lighting
[L] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/lighting_25_400.prt:
Not found. Computing. 0.524556 seconds. (762.55 samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Wall2_geode_0_25_400_DS.prt:
Not found. Computing. (1017 vertices) 15.6853 seconds. (25935.1
samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Wall1_geode_0_25_400_DS.prt:
Not found. Computing. (930 vertices) 14.2079 seconds. (26182.6
samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Floor_geode_0_25_400_DS.prt:
Not found. Computing. (1596 vertices) 21.8676 seconds. (29193.9
samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Sphere_geode_0_25_400_DS.prt:
Not found. Computing. (1040 vertices) 40.8934 seconds. (10172.8
samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Cube_geode_0_25_400_DS.prt:
Not found. Computing. (1029 vertices) 21.3 seconds. (19324
samples/sec)
Total time for loading transfer functions: 113.954178 seconds.
Total loading/computing time: 114.479672 seconds.
Precalculation done, exiting.
===================================================================
Adrian Egli's kdtree
===================================================================
- Parsing command-line arguments.
Using 5 bands (25 coefficients) and 400 samples per vertex.
Deleting previously calculated data files to recalculate them.
- Loading model file data/PRT_test_scene_9b.ive.
- Optimizing model data/PRT_test_scene_9b.ive.
- Loading/Computing SH coefficients for lighting
[L] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/lighting_25_400.prt:
Not found. Computing. 0.524088 seconds. (763.23 samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Wall2_geode_0_25_400_DS.prt:
Not found. Computing. (1017 vertices) 2.50832 seconds. (162181
samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Wall1_geode_0_25_400_DS.prt:
Not found. Computing. (930 vertices) 2.11397 seconds. (175972
samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Floor_geode_0_25_400_DS.prt:
Not found. Computing. (1596 vertices) 3.74179 seconds. (170614
samples/se
c)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Sphere_geode_0_25_400_DS.prt:
Not found. Computing. (1040 vertices) 2.27624 seconds. (182758
samples/sec)
[DS] Checking for precomputed radiance transfer data file
data/PRT_test_scene_9b/Cube_geode_0_25_400_DS.prt:
Not found. Computing. (1029 vertices) 2.72599 seconds. (150991
samples/sec)
Total time for loading transfer functions: 13.366302 seconds.
Total loading/computing time: 13.891279 seconds.
Precalculation done, exiting.
--
______________________________________________________
Jean-Sebastien Guay [EMAIL PROTECTED]
http://www.cm-labs.com/
http://whitestar02.webhop.org/
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